A microprocessor controlled configurable logic circuit achieves versatility by including a configurable combinational logic element, a configurable storage circuit, a configurable status buffer, and a configurable output select logic. The input signals to the configurable combinational logic element are input signals to the configurable logic circuit and feedback signals from the storage circuit. The storage circuit may be configured to operate as a D flip-flop with or without set and reset inputs, or as an edge detector. In conjunction with the combinational logic element, the storage circuit may also operate as a stage of a shift register or counter. The output select logic selects output from among the output signals of the combinational logic element and the storage circuit. The configurable status buffer may be configured to provide status information on selected important internal signals of the configurable logic circuit. A microprocessor interface structure may access an array of these configurable logic circuits through the status buffer to read different internal output signals from different circuits in the array. Providing separate input and output to a microprocessor leaves the storage element free for other uses and does not require the logic provided by the logic elements.
|
1. A configurable logic element comprising:
means for receiving a first plurality of n binary input signals; means for receiving a second plurality of m binary feedback signals; means for selecting K of said m+n binary signals (where K≦M+n); configurable combinational logic means for receiving said K binary signals from said means for selecting, said configurable combinational logic means having a plurality of configurations for generating selected binary output signals; a first configurable storage circuit for receiving selected ones of said binary output signals of said configurable combinational logic means and selected ones of said n binary input signals and for generating said m binary feedback signals, said configurable storage circuit having a plurality of configurations; a configurable select logic comprising means for receiving said output signals generated by said combinational logic means and said m binary signals generated by said configurable storage circuit and means for selecting output signals from among the signals received by said select logic; and means for reading the status of a selected one of said output signals of said combinational logic means and said m feedback signals.
5. A configurable logic element comprising:
means for receiving a first plurality of n binary input signals; means for receiving a second plurality of m binary feedback signals; means for selecting K of said m+n binary signals (where K≦M+n); configurable combinational logic means for receiving said K binary signals from said means for selecting, said configurable combinational logic means having a plurality of configurations for generating selected binary output signals; a first configurable storage circuit for receiving selected ones of said binary output signals of said configurable combinational logic means and selected ones of said n binary input signals and for generating said m binary feedback signals, said configurable storage circuit having a plurality of configurations; a configurable select logic comprising means for receiving said output signals generated by said combinational logic means and said m binary signals generated by said configurable storage circuit and means for selecting output signals from among the signals received by said select logic; a second storage circuit for storing a storage data signal and for providing an output signal representing said storage data signal; and configurable means for providing said output signal of said second storage circuit to said means for receiving a first plurality of n binary input signals.
2. A configurable logic element as in
a second storage circuit for storing a data signal and for providing an output signal representing said stored data signal; and configurable means for receiving said output signal of said second storage circuit and providing said output signal of said second storage circuit to said means for receiving a first plurality of n binary input signals, said output signal of said second storage circuit being one of said n binary input signals.
3. A configurable logic element as in
4. A configurable logic element as in
a configurable switch for receiving said output signals of said combinational logic circuit and said m binary feedback signals, said configurable switch having a plurality of configurations, said configurable switch providing in each configuration a signal representing a different one of the signals received by said configurable switch; and a three-state buffer for receiving the signal provided by said configurable storage circuit and for providing an output signal representing the signal received by said three-state buffer when said three-state buffer is enabled.
6. A configurable logic array comprising:
a plurality of configurable logic elements, each of said configurable logic elements being as in means for selectively communicating data signals from a data bus to each of said second storage circuits.
7. A configurable logic array as in
8. A configurable logic array as in
9. A configurable logic array comprising:
a plurality of configurable logic elements each of said configurable logic elements being as in means for selecting particular ones of said means for reading the status and for providing the signal read by said particular ones of said means for reading to a data bus.
10. A configurable logic array as in
11. A configurable logic array comprising:
a plurality of configurable logic elements, each of said logic elements being as in a buffer having a first state for receiving a selected signal read by one of said means for reading the status and for providing said selected signal to a microprocessor, and a second state for providing a data signal from said microprocessor to one of said second storage circuits.
|
This application is a continuation in part of U.S. patent application Ser. No. 706,429, filed, Feb. 27, 1985, now U.S. Pat. No. 4,706,216, issued 11-10-87 which is incorporated herein by reference.
This invention relates to a configurable logic element in general and in particular, to a configurable logic element which is composed of a configurable combinational logic element, a configurable storage element and a configurable output select logic. The output signals of the configurable storage element serve as input signals to both the configurable combinational logic and the output select logic. The output signals of the output select logic are selected from the output signals of the combinational logic element and the output signals of the storage element. A microprocessor oriented configurable logic element is disclosed which includes additional circuitry which allows easy interface to a microprocessor without utilizing the other resources of the configurable logic element. In particular a microprocessor oriented configurable logic element is disclosed which includes a second storage circuit for storing data written from a microprocessor and for providing a signal representing the stored data to the combinational logic element, and means for allowing a microprocessor to read the status of selected ones of the output signals of the combinational logic element, the configurable storage element, and the storage circuit.
In copending patent application Ser. No. 06/588,478, filed Mar. 12, 1984 by Ross H. Freeman and entitled "CONFIGURABLE LOGIC ARRAY" which is incorporated herein by reference, a structure is described which allows changing the configuration of a finished integrated circuit from time to time (even when the integrated circuit is installed in a system) to provide any one of a plurality of logical functions from the same integrated circuit. This is accomplished by providing a number of "configurable logical elements" (herein referred to as "configurable logic elements") each of which is capable of being configured to implement any one of a plurality of logic functions depending on the task which it is called upon to perform. By configurable logic element (CLE) is meant a combination of devices which are capable of being electrically interconnected by switches operated in response to control bits stored on the chip (or transmitted to the chip) to perform any one of a plurality of logical functions. The configurable logic element disclosed in application Ser. No. 06/588,478 may include all of the circuit elements necessary to provide one or more of the functions provided by, for example, an AND gate, flip-flop, inverter, NOR gate, exclusive OR gate, and combinations of these functions to form more complex functions. The particular function to be carried out by a configurable logic element is determined by control signals applied to the configurable logic element from control logic. Depending on the control signals, a configurable logic element can function as an AND gate, an OR gate, a NOR gate, a NAND gate, or an exclusive OR gate or any one of a number of other logic functions without change in physical structure. Structure is provided on chip to allow any one of a plurality of functions to be implemented by the configurable logic element. This is done by providing control logic to store and generate control signals which control the configuration of the configurable logic element.
In one embodiment, the control signals are stored and transmitted by control logic formed integrally with and as part of the integrated circuit chip containing the configurable logic elements. However, if desired, the control information can be stored and/or generated outside the integrated circuit and transmitted through pins to the configurable logic element.
In general, a given set of control signals in the form of control bits is transmitted from the control logic to a configurable logic element to control the configuration of that configurable logic element. The actual set of control bits provided to the configurable logic element on the integrated circuit chip depends on the function to be carried out by the configurable logic element on the chip.
In copending U.S. application Ser. No. 706,429,filed Feb. 27, 1985, on an invention of William S. Carter, a particularly versatile configurable logic element is described which includes a configurable combinational logic element, a configurable storage element and a configurable output select logic. The output signals of the configurable storage element serve as input signals to both the configurable combinational logic and the output select logic. This configurable logic element, however, is not well suited to easy communication with a microprocessor since, for example, if a data signal from a microprocessor is stored in the configurable storage element, the configurable storage element is then not available to receive other output signals from the configurable combinational logic element. Moreover, communication between an array of such configurable logic elements and a microprocessor would require use of the general interconnect structure of the configurable logic array, reducing the versatility of the array.
A microprocessor oriented configurable logic element is disclosed which includes the great versatility, in the selection of the functions it is capable of implementing, of the configurable logic element described in U.S. Pat. Application Ser. No. 706,429. The microprocessor oriented configurable logic element includes a combinational logic element, a first storage element, and an output select logic, each of which is configured by control bits. Selected input signals to the configurable logic element together with selected "feedback" signals from the storage element are the input signals to the combinational logic element. The input signals to the configurable logic element together with the output signals of the combinational logic element provide input signals to the configurable storage element. The output select logic provides output signals which are selected from the output signals of the combinational logic element and the storage element.
The microprocessor oriented configurable logic element includes additional circuitry which allows easy interface to a microprocessor without utilizing the other resources of the configurable logic element. In particular, the microprocessor oriented configurable logic element also includes a bidirectional data bus and a second storage circuit for storing a data signal written by a microprocessor and for providing the stored signal to the combinational logic element and means for allowing the microprocessor to read the status of selected ones of the output signal of the combinational logic element, the configurable storage element, and the second storage circuit.
This invention will be more fully understood with reference to the following detailed description and accompanying drawings.
FIG. 1 illustrates some of the various logic functions capable of being implemented by a configurable logic element in a configurable logic array;
FIG. 2 illustrates the internal logic structure of one possible configurable logic element capable of implementing a number of useful functions of two variables A and B;
FIG. 3A illustrates a 16 bit RAM circuit wherein any one of sixteen possible input states is capable of being identified and 216 functions are capable of being implemented;
FIG. 3B illustrates a selection structure for selecting any one of sixteen bits capable of implementing 216 functions, for transmittal to an output lead;
FIG. 3C illustrates one possible Karnaugh map for the structure of FIG. 3A;
FIG. 3D illustrates the logic gates represented by placing a binary one in the Karnaugh map of FIG. 3C at the intersections of the first and second rows and the first column.
FIG. 4A illustrates a plurality of configurable logic elements (shown as nine logic elements) formed on an integrated circuit chip together with programmable interconnects formed between selected leads to yield desired logic functions and with selected input/output pads and interconnections of the leads between logic elements;
FIG. 4B shows the key to the cross connections between crossing conductive leads in FIG. 4B;
FIG. 5 represents a portion of the circuitry of a novel combination static and dynamic shift register appropriate for use with the microprocessor oriented configurable logic array of this invention;
FIGS. 6A through 6H represent wave forms of use in explaining the operation of the structure of FIG. 5;
FIG. 7 shows a configurable logic element described in copending U.S. application No. 706,429;
FIG. 8 shows one embodiment of the configurable logic element of FIG. 7; and
FIG. 9 shows one embodiment of the storage element 121 of FIG. 8.
FIG. 10 shows one embodiment of the microprocessor oriented configurable logic element of the present invention.
FIG. 11 shows a chip employing an array of the microprocessor oriented configurable logic elements shown in FIG. 10.
FIG. 12 shows a schematic diagram of CLA microprocessor interface logic 180 shown in FIG. 11.
FIG. 13 shows read cycle timing for circuit 300 shown in FIG. 11.
FIG. 14 shows write cycle timing for circuit 300 shown in FIG. 11.
FIG. 15 shows a system employing the chip of FIG. 11 in combination with a microprocessor and memory.
The following detailed decription of this invention is meant to be illustrative only and not limiting. Other embodiments of this invention will be obvious to those skilled in the art in view of the following disclosure.
Copending U.S. application No. 588,478, filed Mar. 12, 1984, on an invention of Ross H. Freeman entitled "Configurable Logic Array" is incorporated herein by reference.
It is necessary to explain the configurable logic elements and general interconnect structure of the configurable logic array described in the above copending application in order to explain the particular configurable logic element of the present invention.
FIG. 1 illustrates certain logic functions capable of being implemented by a configurable logic element. The 28 functions shown in FIG. 1 are merely illustrative and other elements not shown can, if desired, be implemented by a configurable logic element. The following functions are shown:
______________________________________ |
Element Function |
______________________________________ |
1 AND gate |
2 NAND gate |
3 AND gate with inverted input |
4 NAND gate with inverted input |
5 OR gate |
6 NOR gate |
7 exclusive OR gate |
8 exclusive NOR gate |
9 3 input AND gate |
10 3 input NAND gate |
11 3 input OR gate |
12 3 input NOR gate |
13 OR gate with one input comprising AND gate |
14 NOR gate with one input comprising AND gate |
15 AND gate with one input comprising OR gate |
16 NAND gate with one input comprising OR gate |
17 3 input AND gate with one input inverted |
18 3 input NAND gate with one inverted input |
19 3 input OR gate with one inverted input |
20 3 lead NOR gate with one inverted input |
21 one of two inputs multiplexer |
22 inverting one of two inputs multiplexer |
23 "D" flip flop reset |
24 Set-Reset latch |
25 "D" flip-flop with reset and inverted |
output |
26 Set-reset latch with reset and inverted |
output |
27 "D" flip-flop with set |
28 "D" flip-flop with set and inverted output |
______________________________________ |
of course, other logic functions can also be implemented in a configurable logic element.
FIG. 2 illustrates the internal logic structure of one possible configurable logic element which is capable of implementing all useful basic functions of the two variables A and B, with the functions being selected by configuration control signals C0, C0C1, C1, . . . through C5 on control leads C0, C0, . . . through C5. (In this example, all control leads are connected to the gates of N channel enhancement mode pass transistors.) To implement an AND gate function using the structure shown in FIG. 2, the input leads labeled A and B are shunted past inverters 21 and 22, respectively, to AND gate 25 by high level signals on the C1 and C0 configuration control leads which, being connected to the gates of N channel enhancement mode pass transistors 29c and 29d, cause pass transistors 29c and 29d to turn on.
Low level signals are applied to the configuration control leads C0 and C1, thus blocking the output signals of inverters 21 and 22 from AND gate 25. In addition, a high level signal on lead C5 is applied to enable AND gate 25. Thus three input AND gate 25 functions as a two-input AND gate with respect to the signals A and B. The output signal of AND gate 25 provides one input signal to NOR gate 26. A second input signal to NOR gate 26 is provided by the output signal of AND gate 24. The output signal of AND gate 24 is held at a logical 0 by applying a logical 0 to configuration control lead C4. Thus the control signals C2 and C3 are "don't cares", that is, these signals can be high or low without affecting the output signal of AND gate 24. Since the output signal of AND gate 24 is a logical 0, and since the tristate control input signal to NOR gate 26 is a logical 0, it is easy to see that AND gate 25, AND gate 24 and NOR gate 26 function together as a NAND gate with respect to input signals A and B. Since the three-state control signal input to NOR gate 27 is a logical 0 (except during reset), NOR gate 27 serves as an inverter with respect to the output signal of NOR gate 26. The output signal of NOR gate 26 is applied to the gate of N channel transistor 29a (the source of which is grounded and the drain of which is connected to output lead 28) and the complement of the output signal of NOR gate 26 is applied to the gate of N channel transistor 29b (the source of which is connected to a power supply and the drain of which is connected to both the output lead 28 and the drain of N channel transistor 29a). Thus, transistors 29a and 29b function as an inverter with respect to the output signal of NOR gate 26. Thus, the structure of FIG. 2 configured as described above performs the function of an AND gate with respect to the signals A and B. Other logic functions can also be produced by appropriate selection of the control signals to be supplied to the configuration control leads C0 through C5 to activate the appropriate pass transistors and gates within the structure.
FIG. 3A illustrates a 16 bit RAM capable of producing an output signal in response to any one of sixteen possible combinations of input signals. Thus input signals A and B control the X decoder to select any one of the four columns in the 16 bit RAM. Input signals C and D control the Y decoder to select any one of the four rows in the 16 bit RAM. The 16 bit RAM produces an output signal representative of the bit at the intersection of the selected row and column. There are 16 such intersections and thus sixteen such bits. There are 216 possible combinations of functions capable of being represented by 16 bits. Thus, if a NOR gate is to be simulated by the 16 bits in the RAM, the Karnough map for the RAM would be as shown in FIG. 3C. In FIG. 3C all bits are "0" except the bit at the intersection of the first row (representing A=0, B=0) and the first column (representing C=0, D=0). Should a less frequently used function be desired to be generated by the 16 bit RAM, (for example, should a "1" output signal be desired for A=1, B=0, C=0 and D=0) then a binary "1" is stored at the intersection of the second row and the first column. Should a binary "1" be desired both when A=0, B=0, C=0 and D=0 and also when A=1, B=0, C=0 and D=0, then a binary "1" is stored at each of the intersections of the first column with the first row and the second row. The logic circuit represented by this loading of the RAM is as shown in FIG. 3D. Thus the RAM of FIG. 3A represents an elegant and simple implementation of any one of 216 logic functions.
FIG. 3B shows another structure for yielding any one of sixteen select bits. Each of registers 0-15 in the vertical column to the left labeled "16 Select Bits", contains a selected signal, either a binary 1 or 0. By selecting the proper combination of A, B, C, and D, a particular bit stored in a particular one of the sixteen locations in the 16 Select Bits register is transmitted to the output lead. Thus, for example, to transmit the bit in the "1" register to the output lead, the signal A, B, AC, and D is applied to the leads so labeled. To transmit the signal labeled "15" in the sixteenth location in the 16 Select Bits register to the output lead, the signal A, B, C, and D is applied to the appropriate columns. Again, any one of 216 logic functions can be implemented using this structure.
FIGS. 4A illustrates a configurable logic array (CLA) containing nine configurable logical elements. As shown in FIG. 4A, each CLE of the nine CLEs 40-1 through 40-9 has a plurality of input leads and one or more output leads. Each input lead has a plurality of access junctions each connecting a selected general interconnect lead to the input lead. The access junctions for input lead 2 of CLE 40-7 are labeled A1 through A4 in FIG. 4A. The access junctions form the other input leads are indicated schematically but are not labeled for the sake of clarity. Similarly, each output lead of each CLE has a plurality of access junctions each connecting the output lead to a corresponding one of the general interconnect leads. The access junctions are indicated schematically for each output lead of each CLE in FIG. 4A. The access junctions for the output lead of CLE 40-7 are labeled B1 through B5. The leads in FIG. 4A which are neither input leads nor output leads are called general interconnect leads and the junctions in FIG. 4A which are not access junctions for input and output leads are called general interconnect junctions. As shown in FIG. 4A, nine logic elements are placed on an integrated circuit chip together with programmable access junctions and a general interconnect structure which comprises general interconnect leads and programmable general interconnect junctions for connecting various leads to other leads. The general interconnect structure includes a set of general interconnect leads and of programmable junctions interconnecting the general interconnect leads having the property that for each general interconnect lead in the general interconnect structure there is a programming of the general interconnect junctions which connects the given general interconnect lead to one or more other leads in the general interconnect structure. Moreover, there is a programming of the junctions (both access and general interconnect) such that for any given output lead of any CLE in the CLA, and for any given input lead of any other CLE in the CLA, there is a programming of the junctions such that the given output lead is connected to the given input lead. An electrical path from a given output lead to a given input lead always contains at least two access junctions and at least a portion of a general interconnect lead. For example, one electrical path from the output lead of CLE 40-8 to the second input lead of CLE 40-9 contains access junctions A7 and B7 and the marked portion P of a general interconnect lead. Typically, an electrical path from an output lead of one CLE to an input lead of another CLE will also contain one or more general interconnect junctions. Each of logic elements 40-1 through 40-9 represents a collection of circuitry such as that shown in FIG. 2 or some similar structure capable of being configured as described above in FIG. 2 to perform any one of a number of logic functions. To program the circuitry (both the configurable interconnect switches and the configurable logic elements), selected signals are applied to input leads identified as configuration control input leads thereby to generate a desired logical function in each of the logic elements and to interconnect the logic elements as desired. In FIG. 4A, no specific lead has been identified as an input lead for the configuration control signals. However, any particular I/O pad can be selected for this purpose. The configuration control bits can be input into the configurable logic array either in series or in parallel depending upon design considerations where they are typically stored in a programming register (shown in FIG. 5). Alternatively, the configuration control bits may be stored in a memory on chip. In addition, another I/O pad will be used for an input clock signal which is used, inter alia, for the loading of the configuration control signals into the programming register. When the configurable logic array shown in FIG. 4A has been configured, selected output signals of logic elements 40-1 through 40-9 are provided to selected I/0 pads. FIG. 4B illustrates the meaning of the junction symbols used in FIG. 4A.
The configurable logic array described above is relatively inefficient in use of chip area compared to a hard wired circuit that performs the same function. The advantage of this circuitry, however, is that it allows the user to program and, if necessary, reprogram the circuit. Only one kind of chip need be kept in inventory. If mistakes in programming are discovered, the user can reprogram his chips relatively easily (in the prior art the parts are thrown away after being incorrectly programmed and new ones programmed). Long manufacturing cycles required where the manufacturer programmed the products are avoided. Here the chip is manufactured as a standard product which later can be configured to the user's specifications.
To configure a logic element such as logic element 40-1 (FIG. 4A), a number of bits must be applied to the configuration control leads such as leads C0 through C5, as shown, for example, in FIG. 2. To do this a shift register, for example, is utilized as part of each configurable logic element. FIG. 5 illustrates a shift register which may be used. The shift register of FIG. 5 is illustrated showing two basic storage cells. Each storage cell is capable of storing one bit of information. Of course, an actual shift register will contain as many storage cells as required to configure the logic element of which the shift register is a part, to its desired configuration. In operation, an input signal is applied to input lead 58. This input signal (shown in FIG. 6D) contains the bit stream to be stored in the shift register as configuration control bits to configure the configurable logic element to perform a desired logic function or to configure (program) an access junction or a general interconnect junction between general interconnect leads in a manner to be described shortly. Thus the sequence of pulses applied to input lead 58 represents those pulses which when stored in the storage cells of the shift register will activate the configuration control bits in the proper manner to achieve the desired functional and/or interconnection result. For example, if the circuit of FIG. 2 is to be configured to form an AND gate, the pulses C0, C1, C2, C3, C4, and C5 would be represented by 1,1,X,X, 0,1.
The sequence of pulses applied to input lead 58 is synchronized with clocking pulses φ1 and φ2 applied to leads 57 and 59 respectively. Thus in the first period of operation clocking pulse φ1 goes high (FIG. 6A), clocking pulse φ2 is low (FIG. 6B), the hold signal (FIG. 6C) is low during shifting thereby facilitating the passage of data through sequentially connected cells 5-1, 5-2, et al., of the shift register. To shift the pattern 01010 into the shift register, the following operations occur: The input signal on lead 58 is low during approximately the first half cycle of the clocking period t1. The output signal Q1 of inverter 51-1 goes to a high level in response to the low level input signal and φ1 high to enable pass transistor 53-1. Some time through the first clocking period t1, the clock signal φ1 goes low (FIG. 6A) and the clock signal φ2 shortly thereafter goes high (FIG. 6B) to enable pass transistor 55-1. Consequently, the high level output signal Q1 is transmitted to the input lead of inverter 52-1 by enabled pass transistor 55-1 and thereby produces a low level output signal Q1 on the output lead of inverter 52-1. Thus at the end of period t1, the output signal Q1 (FIG. 6F) from inverter 52-1 is low level. The output signals Q1 and Q2 from inverters 51-2 and 52-2 in the second cell are still indeterminate because no known signal has yet propagated to the second storage cell 5-2 to change the signals of these inverters to a known state.
At the beginning of the second period (labeled "t2" in FIG. 6A), φ1 goes high (FIG. 6A) and φ2 is low (FIG. 6B) having gone low before period t1 ended. The input signal (FIG. 6D) now has risen to a high level representing a binary 1 and thus the output signal Q1 of inverter 51-1 has gone low. The output signal Q1 of inverter 52-1 remains low because pass transistor 55-1 is held off by the low level φ2 signal. Some time through the second period φ1 goes low followed a fraction of time later by φ2 going high. At this time, the output signal Q1 is transmitted through pass transistor 55-1 to inverter 52-1 thereby driving the output signal φ1 from inverter 52-1 to high level. Meanwhile, during period t2 the previous low level signal on φ1 has driven the output signal Q1 of inverter 51-2 to a high level when φ1 was at a high level to enable pass transistor 53-2 and the change in φ2 from a low level to a high level in the second half of period t2 to enable pass transistor 55-2 drives the output signal Q2 from inverter 52-2 to a low level. In this manner, the input signal on lead 58 (FIG. 6D) is transmitted through each of the cells 5-1, 5-2, 5-3 et al. in the shift register. Upon the transfer into the shift register of the desired information, the hold signal (FIG. 6C) is enabled (i.e., driven to a high level) thereby to connect the feedback leads 50-1, 50-2, and 50-3 et al. from the output leads of inverters 52 to the input leads of inverters 51 so as to hold the information then in each cell indefinitely. In operation, the signal stored in a given cell e.g. 5-1 is connected to a configuration control or to an interconnect pass device, such as devices 60-1 and 60-2 (FIG. 5).
The output signals Q1, Q1, Q2, Q2, etc., of the shift register are directly connected to the (configuration) control inputs of a logic element or the pass devices of the general interconnect junctions.
When φ1 is low, φ2 and hold may be brought high, thus holding the data indefinitely. The entire shift register may be set or cleared by setting or clearing the input with φ1 and φ2 both high and HOLD low. Enough set/reset time must be allowed for the signal to propagate the entire length of the shift register to clear the shift register in this manner. Naturally this time is dependent upon the length of the shift register.
The shift register operates in its dynamic phase by storing the information being shifted as charge on the gates of the transistors (not shown in FIG. 5 but well-known) comprising inventers 51-1, 52-1, 51-2, 52-2 et al. of the shift register. These inverters are of well-known design and will not be described in detail. The use of dynamic shift register is important because a dynamic shift register basic cell uses six transistors and thus takes up very little area. The dynamic shift register is converted to a static latch by adding only one transistor per basic cell. Thus the dynamic shift register (static latch) can be easily fabricated as part of a configurable logic element without adding significant complexity to the circuit or consuming significant semiconductor area. Because of the "hold" signal, the dynamic shift register can become a static latch because placing the shift register on hold automatically refreshes the data. Thus a separate refresh circuit is not needed.
It is apparent from the above description that the dynamic shift register (static latch) circuit does not need refreshing once it has been latched into a hold state. This is accomplished by use of the feedback circuit comprising lead 50-1 and pass transistor 54-1 in cell 5-1, for example.
FIG. 7 shows a block diagram of the configurable logic element 99 described in U.S. application, Ser. No. 706,429. The circuitry of element 99 is included in the present invention. The circuitry includes configurable combinational logic 100, configurable storage circuit 120 and configurable output select logic 140. The combinational logic 100 receives the N binary input signals to the configurable logic element 99 and M binary "feedback" signals from storage circuit 120. Combinational logic 100 is configurable into a plurality of configurations. Each configuration implements one or more selected combinational logic functions of one or more selected subsets of the input signals to the combinational logic. Since combinational logic 100 is configurable, it can be employed to implement a variety of different functions. Moreover, two or more selected functions may be implemented simultaneously, appearing on separate output leads of the configurable logic element 100. In more detail, combinational logic 100 selects K binary input signals from among its M+N binary input signals (K≦M+N). Combinational logic circuit 100 is responsive to a plurality of sets of values of a first set of configuration signals including at least a first set of values for which configurable combinational logic 100 implements a first set of functions, each of which is a function of some of said K binary signals, and a second set of values for which configurable combinational logic 100 implements a second set of functions, each of which is a function of some of said K binary signals, where said first set of functions is not the same as said second set of functions. In one embodiment combinational logic 100 has a first configuration which implements a selectable 1 of the 22K binary valued functions of these K binary signals and a second configuration which implements both a selectable 1 of the 22(K-1) binary valued functions of a first selected (K- 1) of the K selected binary input signals and a selectable 1 of the 22(K- 1) binary value functions of a second selected (K-1) of the K selected binary input signals. (The second set of K-1 signals need not be distinct from the first set.) The operation of combinational logic 100 will be more readily understood after a consideration of the specific embodiment described in FIG. 8 which is explained hereafter.
Storage circuit 120 is also configurable and may be programmed to implement, depending on the configuration, one or more storage elements each of which may be, for example, a transparent latch with set and reset, a D flip-flop with set and reset, an edge detector, a stage of a shift register, or a stage of a counter. Configurable storage circuit 120 receives the output signals of combinational logic 100 on bus 161 as well as storage element control signals on bus 162 and selected ones of the N input signals of combinational logic 100 on input bus 160. Output select logic 140 is configured to provide output signals which are selected from among the output signals of the combinational logic element and the storage circuit.
FIG. 8 shows the details of one embodiment of the configurable logic element 99 in FIG. 7. In FIG. 8, the four input signals to the configurable logic element 99 are denoted by A, B, C, D (i.e., N=4). Since the storage circuit 120 provides only a single feedback signal Q to switch 107, M=1. In FIG. 8, K=4 since the signals A, B, C and either D or Q are selected from among the five signals A, B, C, D, and Q. Configurable combinational logic element 100 includes configurable switches 101 through 107, 113, and 114 8-bit RAMs 108 and 109, one of eight select logics 110 and 111, multiplexer 112, and configuration control lead 115 to switches 113 and 114. Each of the configurable switches is configured by control bits from a programming register (not shown) on leads (not shown except for lead 115) as previously explained. Switch 101 may be configured to provide signal A as its output signal or it may be configured to provide signal B as its output signal. Similarly, each of the switches 102 through 107 may be configured to provide a selected 1 of its two input signals as its output signal. Thus, for example, for one selection of configuration control bits, switch 107 provides signal D and the binary signals A, C, and D are provided to both one of eight select logic 110 and one of eight select logic 111 by switches 101 through 103 and 104 through 106, respectively. For each of the eight possible combinations of binary signals A, C and D, select logic 110 selects a unique storage element in RAM 108 and outputs the bit stored in the selected location. One of eight select logic 111 operates similarly with respect to 8-bit RAM 109. Multiplexer 112 provides either the output signal from select logic 110 or the output signal from select logic 111, depending on the state of signal B. For this configuration, the control bit applied on lead 115 causes switches 113 and 114 to simultaneously pass the output signal from multiplexer 112 to output leads F1 and F2 of combinational logic element 100. The two 8-bit RAMs 108 and 109 can be programmed with binary bits in 216 different ways. Each choice of programming of the 8-bit RAMs causes the combinational logic of element 100 to implement one of the 216 =224 possible logic functions of the four binary variables A, B, C and D. (Here K=4.) (A logic function is a binary valued function of binary variables.)
For another selection of configuration control bits, switch 107 provides feedback signal Q from storage circuit 120 and switches 101 through 103 and 104 through 106 and 113 and 114 are configured as before. Then the combinational logic element 100 implements one of the 216 =224 possible logic functions of the four binary variables A, B, C and Q for each choice of programming of the two 8 bit rams 108 and 109. (Here again K=4.)
For another selection of configuration control bits, switch 101 through 103 provide signals A, C and Q, and switches 104 through 106 provide signals B, C, and Q, respectively, and the control signal applied to lead 115 causes switches 113 and 114 to provide the output signal of select 110 on lead F2 and the output signal of select 111 on lead F1, respectively. Thus, this configuration implements on lead F1 one of the 28 =223 logic functions of the three binary variables A, C, and Q for each of the 28 possible programmings of 8-bit RAM 108 and on lead F2 implements one of the 28 logic functions of the three binary variables B, C and Q for each of the 28 =223 possible programmings of RAM 109.
In general, for any first selection of three of the four variables A, B, C and D/Q, and for any second selection of three of the four variables A, B, C and D/Q, there is a configuration of the combinational logic element 100 which implements one of the 223 logic functions of the first selection of three variables on output lead F2 for each of the 28 possible programmings of 8-bit RAM 108 and one of the 223 logic functions of the second selection of three variables on output lead F1 for each of the 28 possible programmings of RAM 109.
In another embodiment (not shown), each of the 8-bit RAMs may be "subdivided" by providing each with two additional one of four select logic so that any four binary functions of two of the variables A, B, C and D/Q are implemented on four additional output leads of the combinational logic element 100. Similarly, in another embodiment (not shown) a 32 bit RAM and the signals A, B, C, and D and the feedback signal Q are all used (so that K=5) to implement in one configuration one of the 225 binary functions corresponding to each programing of the 32 bit RAM (here N=4, M=1, and K=5) In another configuration (not shown) N=4, M=1, K=5, and a first binary function F1 of the variables A, B, C, a second binary function F2 of the variables B, C, D and a third binary function F3 of the variables B, C, D, Q are, implemented. It is important to observe that 2K' 1 + 2K' 2 +2K' 3 =2K where K'i is the number of variables of which Fi is a function for i=1, 2, 3. Returning to FIG. 8, it is also important to observe that configurable switches 101, 102 and 103 select a subset of their input signals and provide the selected subset of input signals on a one-to-one basis to selected input leads of circuit 110. For example, in response to one set of values of configuration signals, configurable switches 101, 102 and 103 provide signal A to lead 110-3, signal B to lead 110-2, and signal C to lead 110-1.
The output signals on leads F1 and F2 are input signals to configurable storage circuit 120. Signals A, C, and D are also input signals to storage circuit 120, along with clock signal CLK. Configurable storage circuit 120 includes programmable switches 122, 123, 126, 127 and 128, exclusive OR gates 124, 129 and 130, AND gates 125, 131 and 132, and storage element 121. Storage element 121 has set, reset, data and clock input leads denoted by S, R, D and Ck, respectively, and output leads QFF and QLA.
Switches 123, 126, 127 and 128 are each configured to select one of their input signals as an output signal. The set, clock, and reset functions associated with the set, clock, and reset input leads of storage element 121 are all active high but each may be rendered active low relative to the output signal of switches 123, 127, and 129 respectively by applying a logical 1 to the leads INVS, INVC, and INVR of exclusive-OR gates 124, 129, and 130 respectively. (If a logical 0 is applied to leads INVS, INVC, and INVR, the polarity of the output signals of the exclusive-OR gates 124, 129, and 130 is the same as that of the input signals. If a logical 1 is applied to leads INVS, INVC, and INVR, the output signals of exclusive-OR gates 124, 129, and 130 are the inverse of the input signals.)
The AND gates 125, 131, and 132 are enabled by applying a logical 1 to the input leads ENS, ENC, and ENR respectively (and disabled by applying a logical 0). If a logical 0 is applied to one of the input leads ENS, ENC, or ENR, the output of the AND gate is a logical 0 and the associated function of memory circuit 121 is disabled regardless of the state of the corresponding exclusive OR gate. QFF provides a flip-flop output signal an QLA provides a latch output signal as explained later in conjunction with FIG. 9. Configurable switch 122 selects one of the binary singals on leads QFF and QLA and the output signal Q of switch 122 is an input signal to the output select logic 140 and to the configurable combinational logic 100.
FIG. 9 shows one embodiment of memory circuit 121. Memory element 121 comprises two "D" latches LA1 and LA2 connected in series thereby implementing a flip-flop. Latch LA1 includes N channel pass transistors P1 and P2 and NOR gates G1 and G2. The gates of pass transistors P1 and P2 are controlled by the signals CK and CK, respectively. Similarly, latch LA2 includes N channel pass transistors P3 and P4 and NOR gates G3 and G4. The gates of transistors P3 and P4 are controlled by the signals CK and CK, respectively. The D input lead is the data input lead of latch LA1. The S input lead serves as the set input lead of latch LA1 and as the reset input lead of latch LA2. The R input lead serves as the reset input lead of latch LA1 and as the set input lead of latch LA2.
The output signal QHD LA of NOR gate G1 is connected to the data input lead of latch LA2. The output lead QLA is connected to the output lead of NOR gate G2 of latch LA1 and the output lead QFF is connected to the output lead of NOR gate G3 of latch LA2.
Configurable storage circuit 120 (FIG. 8) operates as a transparent latch with set and reset by configuring switch 122 to connect output lead Q to output lead QLA. The output signal on lead QLA follows the input signal while the clock signal CK is low. The output signal on QLA is held when the clock signal CK goes high, turning off pass transistor p1 and turning on pass transistor P2.
Storage circuit 120 may also be configured to operate as a D flip-flop with set and reset. In this configuration, switch 126 is configured to select the signal on lead F1 and gates 125, 131 and 132 are enabled by applying a logical 1 to leads ENS, ENC, and ENR, respectively. Finally, switch 122 is configured to select the output signal on lead QFF of storage element 121. Storage element 120 may also be configured as a D flip-flop without set and reset by modifying the above configuration by applying a logical zero to leads ENS and ENR.
Configurable storage circuit 120 may also be configured to be an SR latch by enabling AND gates 125 and 132, and disabling AND gate 131 so that a logical 0 input signal is provided on the Ck input lead of storage element 121. The logical 0 on lead Ck turns off pass transistor P3 and turns on pass transistor P4. Switch 122 is then configured to select the output signal on QFF.
Finally, storage circuit 120 may also be configured to be an edge detector. For example, to configure storage element 120 as a rising edge detector, AND gate 125 is disabled to provide a logical 0 on input lead S, AND gate 131 is enabled to pass a clock signal to input lead, CK, and switch 126 is configured to select input lead 126a so that a logical 1 is provided to input lead D. AND gate 132 is enabled. A logical 1 reset signal forces the output signal on QFF to a logical 0. A low clock signal turns off pass transistor P2 and P3 and turns on pass transistor P1, permitting NOR gate G1 to invert the logical 1 on lead D, thus providing a logical 0 on node QLA. When the olock siqnal rises, transistors P1 and P4 are turned off, transistors P2 and P3 are turned on, and the logical 0 on node QHD LA is inverted by NOR gate G3, thus providing a logical 1 on output lead QFF which signals that a rising edge has been detected. QFF is then reset to 0 using the reset input, and the edge detector is then ready to detect the next rising edge. (Note that when the clock signal falls, transistors P2 and P3 are turned off and transistor P4 is turned on, and the signal on QFF remains a logical 0 and does not change state until the next rising edge.)
Similarly, storage circuit 120 may be configured as a falling edge detector by applying a logical one signal to lead INVC of exclusive-or gate 129. Clearly, storage circuit 120 may also serve as a stage of a shift register or a stage of a counter.
The output select logic 140 includes configurable switches 141 and 142 which are each configured to select an output signal from among the output signals on leads F1 and F2 from the combinational logic 100 and the output signal of storage element 120.
Configurable logic circuit 99 shown in FIG. 8 is not adapted for ease of communication with a microprocessor. For example, if it is desired to write data from a microprocessor by storing the data in storage element 121, storage element 121 is then not available to receive other output signals from combinational logic element 100. Further, communication between the microprocessor and a configurable logic array containing a plurality of configurable logic elements, each identical to configurable logic element 99, would require the use of the general interconnect structure, reducing the versatility of the logic array.
FIG. 10 shows the configurable logic element 210 of the present invention which is a microprocessor oriented version of CLE 99 shown in FIG. 8. CLE 210 includes all of the circuitry shown in FIG. 8 together with latch 205, programmable switches 201, 202, 203, 204, 206 and three-state buffer 208.
Information is stored in latch 205 by placing a write signal on lead WRY connected to input lead G of latch 205 while simultaneously transmitting the signal to be stored to input lead D via bidirectional data lead DBx. The Q output lead of latch 205 can be connected, if desired, to any one of the input leads A, B, C, or D by appropriately configuring (programming) configurable switches 201, 202, 203, and 204. These connections are accomplished using pass transistors as illustrated in connection with FIG. 2 or similar switching elements as is well known in the art. For example, switch 202 may be configured to connect output lead Q to input lead C. In general, switches 201 through 204 are configured by control bits in a programming register (not shown) connected to the configurable switches by leads (not shown for the sake of clarity).
Similarly, switch 206 is configured by control bits in a programming register (not shown) connected to configurable switch 206 by leads (not shown). Switch 206 may be configured to connect any selected one of leads 206a, 206b, 206c or 206d to output lead 207. Thus switch 206 provides as an output signal on lead 207, the signal stored in latch 205, one of the output signals of the configurable combinational logic 100 or one of the signals stored in storage circuit 121. The particular one of these signals to be provided by switch 206 is determined by the user.
The read signal on lead RD enables three-state buffer 208. When enabled, three-state buffer 208 provides the signal on its input lead 207 to bidirectional data lead DBx. When not enabled, three-state buffer 208 output is in a high impedance state. The state of three-state buffer 208 is controlled by the level of the signal on RDy in a well known manner. Thus by configuring latch 206 and enabling three-state buffer 208, the user may check (read) the status of a selected important internal signal of CLE 210, for example, the status of one of the output signals of combinational logic 100, the status of the output signal of storage circuit 121, or the status of the signal stored in latch 205.
FIG. 11 shows a chip 300 with an 8×8 array of CLEs, namely, CLE(x,y), x, y =0, . . . , 7, each CLE being the same as CLE 210 (FIG. 10). (In another embodiment (not shown), only selected CLEs in the array shown in FIG. 11 are idential to CLE 210, the remaining CLEs being as shown in FIG. 8). A microprocessor interface structure 180 produces read and write signals which activate each register R0 through R7. Register Ry contains 8 configurable logic elements, namely, CLE(x, y), x =0, . . . , 7. Although each CLE is identical to CLE 210, each configurable logic element can be configured to provide a different output signal on leads 143 and 144 shown in FIG. 10. The output leads from the configurable logic elements and the general interconnect structure are not shown in FIG. 11 for the sake of clarity.
The microprocessor oriented configurable logic array shown in FIG. 11 has great flexibility by making it possible for the user to write data to each CLE from a microprocessor and to monitor selected internal signals of each CLE in array 300 while leaving storage element 121 free for other uses and without using any of the general interconnect structure (not shown in FIG. 11) of CLA 300. Also, none of the logic provided by the CLEs in the array is used to implement the microprocessor interface logic 180.
Microprocessor interface logic 180 has three kinds of input busses, bus 310a for receiving address signals, bus 310b for receiving the chip enable signals, and bus 310c for receiving control signals. The output signals of microprocessor interface logic 180 are read and write signals transmitted on bus 301 whose dimension depends on the number of registers employed. In this case, bus 301 contains 8 read and 8 write leads.
The microprocessor interface logic 180 and blocks 190° through 1907, which contain a bidirectional buffer for each data line DBo through DB7 respectively, is shown in more detail in FIG. 12. In this example, address bus 310a provides a 3-bit address to microprocessor interface logic 180 which generates a signal which selects the particular register Ry to be read from or written to in FIG. 11. Lead 310b provides a chip enable signal to microprocessor interface logic 180. Control bus 310c includes read and write leads and RD and WR shown in FIG. 12. Read and write signals RD and WR on leads RD and WR generate an input-output signal on lead I/O that determines the state of three-state buffers 1900-1907. For a first selected signal on lead I/O signals are conducted from microprocessor 310 through buffers 190ao -190a7 to data leads DBo -DB7 shown in FIG. 11. For a second selected signal level on lead I/O, data signals are conducted from bus DBo through DBo through DB7 to microprocessor 310 via buffers 190Bo -190B7.
FIGS. 13 and 14 provide an example of read cycle and write cycle timing diagrams for chip 300.
FIG. 15 illustrates a system employing the microprocessor oriented configurable logic array chip 300 shown in FIG. 11. The part of the system shown in FIG. 15 is composed of microprocessor 310, RAM/ROM memory 312, decoder 305, and printer 315 in addition to configurable logic array 300. In this example, configurable logic array 300 is used to interface microprocessor 310 to printer 315. The configurable logic array in such a system replaces small scale integration (SSI), medium scale integration (MSI), and/or large scale integration (LSI) circuitry commonly employed. The microprocessor executes a program stored in ROM/RAM memory 312. Configurable logic array 300 interprets commands received from microprocessor 310 on the DATA bus and in response generates the proper printer control signals which are transmitted to the printer on leads 315A via I/O pins (not shown in FIGS. 11 and 15) similar to the I/O pads shown in FIG. 4A. Configurable logic array 300 also receives the data to be printed from microprocessor 310 on the DATA bus, modifies the data format to be compatible with the printer, if necessary, and transfers the data to the printer via, leads 315b. Status signals generated by printer 315 are received by configurable logic array 300 on leads 315c. The state of these status signals can be transferred to microprocessor 310 via the DATA bus when it reads the appropriate register inside configurable logic array 300.
The above embodiments are intended to be exemplary and not limiting. It will be obvious in view of the disclosures made above that various substitutions and modifications may be made without departing from the scope of the invention.
In the claims which follow, the phrase "means having a configuration in which said means" performs a particular function is used in place of the detailed wording "means which are capable of being configured in response to a selected set of values of a set of configuration signals and which, when configured by said selected set of values," performs a particular function.
Patent | Priority | Assignee | Title |
10031733, | Jun 20 2001 | PACT XPP SCHWEIZ AG | Method for processing data |
10296488, | Sep 06 2002 | PACT XPP SCHWEIZ AG | Multi-processor with selectively interconnected memory units |
5036473, | Oct 05 1988 | QUICKTURN DESIGN SYSTEMS, INC , DELAWARE CORPORATION | Method of using electronically reconfigurable logic circuits |
5055718, | May 11 1990 | Actel Corporation | Logic module with configurable combinational and sequential blocks |
5107146, | Feb 13 1991 | ACTEL CORPORATION, A CORPORATION OF CA | Mixed mode analog/digital programmable interconnect architecture |
5151623, | Mar 29 1985 | Lattice Semiconductor Corporation | Programmable logic device with multiple, flexible asynchronous programmable logic blocks interconnected by a high speed switch matrix |
5172014, | Sep 19 1986 | Actel Corporation | Programmable interconnect architecture |
5185706, | Nov 27 1989 | Lattice Semiconductor Corporation | Programmable gate array with logic cells having configurable output enable |
5187393, | Sep 19 1986 | Actel Corporation | Reconfigurable programmable interconnect architecture |
5198705, | May 11 1990 | Actel Corporation | Logic module with configurable combinational and sequential blocks |
5212652, | Aug 15 1989 | Lattice Semiconductor Corporation | Programmable gate array with improved interconnect structure |
5231588, | Nov 27 1989 | Lattice Semiconductor Corporation | Programmable gate array with logic cells having symmetrical input/output structures |
5233539, | Aug 15 1989 | Lattice Semiconductor Corporation | Programmable gate array with improved interconnect structure, input/output structure and configurable logic block |
5243238, | Mar 17 1989 | Xilinx, Inc | Configurable cellular array |
5255203, | Aug 15 1989 | Lattice Semiconductor Corporation | Interconnect structure for programmable logic device |
5260610, | Sep 03 1991 | ALTERA CORPORATION A CORPORATION OF DELAWARE | Programmable logic element interconnections for programmable logic array integrated circuits |
5260611, | Sep 03 1991 | ALTERA CORPORATION A CORPORATION OF DELAWARE | Programmable logic array having local and long distance conductors |
5260881, | Oct 30 1989 | Lattice Semiconductor Corporation | Programmable gate array with improved configurable logic block |
5274581, | May 08 1992 | ALTERA CORPORATION A CORPORATION OF DELAWARE | Look up table implementation of fast carry for adders and counters |
5309045, | May 10 1991 | Kabushiki Kaisha Toshiba | Configurable logic element with independently clocked outputs and node observation circuitry |
5311080, | Mar 26 1993 | Lattice Semiconductor Corporation | Field programmable gate array with direct input/output connection |
5329179, | Oct 05 1992 | Lattice Semiconductor Corporation | Arrangement for parallel programming of in-system programmable IC logical devices |
5329470, | Dec 02 1988 | Quickturn Systems, Inc. | Reconfigurable hardware emulation system |
5359536, | Aug 15 1989 | Lattice Semiconductor Corporation | Programmable gate array with improved interconnect structure, input/output structure and configurable logic block |
5371422, | Sep 03 1991 | ALTERA CORPORATION A CORPORATION OF DELAWARE | Programmable logic device having multiplexers and demultiplexers randomly connected to global conductors for interconnections between logic elements |
5376844, | Sep 03 1991 | ALTERA CORPORATION A CORPORATION OF DELAWARE | Programmable logic device with multiplexer-based programmable interconnections |
5396127, | Mar 06 1991 | QuickLogic Corporation | Programmable application specific integrated circuit and logic cell therefor |
5410194, | Aug 11 1993 | XILINX, Inc.; Xilinx, Inc | Asynchronous or synchronous load multifunction flip-flop |
5416367, | Mar 06 1991 | QuickLogic Corporation | Programmable application specific integrated circuit and logic cell therefor |
5425036, | Sep 18 1992 | Cadence Design Systems, INC | Method and apparatus for debugging reconfigurable emulation systems |
5430390, | Mar 06 1991 | QuickLogic Corporation | Programmable application specific integrated circuit and logic cell therefor |
5436575, | Sep 03 1991 | ALTERA CORPORATION, A DELAWARE CORPORATION | Programmable logic array integrated circuits |
5440245, | May 11 1990 | Actel Corporation | Logic module with configurable combinational and sequential blocks |
5442306, | Sep 09 1994 | Lattice Semiconductor Corporation | Field programmable gate array using look-up tables, multiplexers and decoders |
5448496, | Oct 05 1988 | Cadence Design Systems, INC | Partial crossbar interconnect architecture for reconfigurably connecting multiple reprogrammable logic devices in a logic emulation system |
5451887, | Sep 19 1986 | Actel Corporation | Programmable logic module and architecture for field programmable gate array device |
5452231, | Oct 05 1988 | Cadence Design Systems, INC | Hierarchically connected reconfigurable logic assembly |
5469003, | Nov 05 1992 | Xilinx, Inc | Hierarchically connectable configurable cellular array |
5477165, | Sep 19 1986 | Actel Corporation | Programmable logic module and architecture for field programmable gate array device |
5477475, | Dec 02 1988 | Cadence Design Systems, INC | Method for emulating a circuit design using an electrically reconfigurable hardware emulation apparatus |
5479113, | Sep 19 1986 | Actel Corporation | User-configurable logic circuits comprising antifuses and multiplexer-based logic modules |
5481486, | May 08 1992 | ALTERA CORPORATION, A DELAWARE CORPORATION | Look up table implementation of fast carry arithmetic and exclusive-OR operations |
5483178, | Mar 29 1993 | ALTERA CORPORATION A CORPORATION OF DELAWARE | Programmable logic device with logic block outputs coupled to adjacent logic block output multiplexers |
5485103, | Sep 03 1991 | ALTERA CORPORATION A CORPORATION OF DELAWARE | Programmable logic array with local and global conductors |
5500608, | Jul 23 1992 | XILINX, Inc. | Logic cell for field programmable gate array having optional internal feedback and optional cascade |
5519629, | Jul 19 1993 | SAMSUNG ELECTRONICS CO , LTD | Tileable gate array cell for programmable logic devices and gate array having tiled gate array cells |
5527745, | Mar 20 1991 | Crosspoint Solutions, Inc. | Method of fabricating antifuses in an integrated circuit device and resulting structure |
5528176, | Nov 05 1992 | XILINX, Inc. | Register with duplicate decoders for configurable cellular array |
5550782, | May 08 1992 | ALTERA CORPORATION, A DELAWARE CORPORATION | Programmable logic array integrated circuits |
5552722, | Nov 05 1992 | XILINX, Inc. | Mask registor for a configurable cellular array |
5570041, | Sep 19 1986 | Actel Corporation | Programmable logic module and architecture for field programmable gate array device |
5586044, | Aug 15 1989 | Lattice Semiconductor Corporation | Array of configurable logic blocks including cascadable lookup tables |
5587669, | Mar 06 1991 | QuickLogic Corporation | Programmable application specific integrated circuit and logic cell therefor |
5587921, | Aug 15 1989 | Lattice Semiconductor Corporation | Array of configurable logic blocks each including a look up table having inputs coupled to a first multiplexer and having outputs coupled to a second multiplexer |
5594364, | Mar 06 1991 | QuickLogic Corporation | Programmable application specific integrated circuit and logic cell therefor |
5596743, | May 28 1993 | Regents of the University of California | Field programmable logic device with dynamic interconnections to a dynamic logic core |
5600265, | Sep 19 1986 | Actel Corporation | Programmable interconnect architecture |
5606266, | Nov 04 1994 | ALTERA CORPORATION, A DELAWARE CORPORATION | Programmable logic array integrated circuits with enhanced output routing |
5606267, | Sep 19 1986 | Actel Corporation | Programmable logic module and architecture for field programmable gate array device |
5610534, | May 11 1990 | Actel Corporation | Logic module for a programmable logic device |
5612891, | Oct 05 1988 | Cadence Design Systems, INC | Hardware logic emulation system with memory capability |
5634003, | Jul 07 1993 | Fujitsu Limited; Fujitsu Automation Limited | Logic simulation apparatus based on dedicated hardware simulating a logic circuit and selectable to form a processing scale |
5644496, | Aug 15 1989 | Lattice Semiconductor Corporation | Programmable logic device with internal time-constant multiplexing of signals from external interconnect buses |
5644515, | Dec 02 1988 | Cadence Design Systems, INC | Hardware logic emulation system capable of probing internal nodes in a circuit design undergoing emulation |
5657241, | Oct 05 1988 | Cadence Design Systems, INC | Routing methods for use in a logic emulation system |
5668771, | Sep 03 1991 | ALTERA CORPORATION, A DELAWARE CORPORATION | Programmable logic array integrated circuits |
5670897, | Nov 05 1992 | XILINX, Inc. | High speed mask register for a configurable cellular array |
5698992, | Sep 19 1986 | Actel Corporation | Programmable logic module and architecture for field programmable gate array device |
5712806, | Oct 30 1995 | International Business Machines Corporation | Optimized multiplexer structure for emulation systems |
5726586, | Mar 06 1991 | QuickLogic Corporation | Programmable application specific integrated circuit and logic cell therefor |
5734581, | Oct 05 1988 | Quickturn Design Systems, Inc. | Method for implementing tri-state nets in a logic emulation system |
5740069, | Aug 15 1989 | Lattice Semiconductor Corporation | Logic device (PLD) having direct connections between configurable logic blocks (CLBs) and configurable input/output blocks (IOBs) |
5742180, | Feb 10 1995 | Massachusetts Institute of Technology | Dynamically programmable gate array with multiple contexts |
5744979, | Jul 23 1992 | XILINX, Inc. | FPGA having logic cells configured by SRAM memory cells and interconnect configured by antifuses |
5744980, | Feb 16 1996 | MICROSEMI SOC CORP | Flexible, high-performance static RAM architecture for field-programmable gate arrays |
5760611, | Oct 25 1996 | International Business Machines Corporation | Function generator for programmable gate array |
5764583, | Sep 03 1991 | Altera Corporation | Programmable logic array integrated circuits |
5770951, | Jan 20 1995 | XILINX, Inc. | Configuration logic to eliminate signal contention during reconfiguration |
5777489, | Oct 13 1995 | Mentor Graphics Corporation; MENTOR GRAPHICS HOLDING LTD | Field programmable gate array with integrated debugging facilities |
5781033, | May 11 1990 | Actel Corporation | Logic module with configurable combinational and sequential blocks |
5796623, | Oct 05 1988 | Quickturn Design Systems, Inc. | Apparatus and method for performing computations with electrically reconfigurable logic devices |
5798656, | Nov 05 1992 | XILINX, Inc. | Match register with duplicate decoders |
5805477, | Sep 26 1996 | AVAGO TECHNOLOGIES GENERAL IP SINGAPORE PTE LTD ; AVAGO TECHNOLOGIES GENERAL IP PTE LTD | Arithmetic cell for field programmable devices |
5805834, | Mar 30 1994 | ACACIA PATENT ACQUISITION LLC | Hot reconfigurable parallel bus bridging circuit |
5809281, | Mar 30 1993 | Altera Corporation | Field programmable gate array with high speed SRAM based configurable function block configurable as high performance logic or block of SRAM |
5812414, | Oct 05 1988 | Quickturn Design Systems, Inc. | Method for performing simulation using a hardware logic emulation system |
5812479, | Sep 03 1991 | Altera Corporation | Programmable logic array integrated circuits |
5815003, | Nov 04 1994 | ALTERA CORPORATION, A DELAWARE CORPORATION | Programmable logic integrated circuits with partitioned logic element using shared lab-wide signals |
5828229, | Sep 03 1991 | ALTERA CORPORATION A CORPORATION OF DELAWARE | Programmable logic array integrated circuits |
5831448, | Nov 05 1992 | XILINX, Inc. | Function unit for fine-gained FPGA |
5838628, | Sep 03 1991 | Altera Corporation | Programmable logic array integrated circuits |
5841296, | Jan 21 1997 | XILINX, Inc. | Programmable delay element |
5841967, | Oct 17 1996 | Cadence Design Systems, INC | Method and apparatus for design verification using emulation and simulation |
5848005, | Sep 03 1991 | Altera Corporation | Programmable logic array integrated circuits |
5883525, | Apr 01 1994 | XILINX, Inc. | FPGA architecture with repeatable titles including routing matrices and logic matrices |
5883850, | Sep 03 1991 | ALTERA CORPORATION, A DELAWARE CORPORATION | Programmable logic array integrated circuits |
5884066, | May 13 1997 | Cadence Design Systems, INC | Method and apparatus for a trace buffer in an emulation system |
5889706, | May 31 1996 | NEC Corporation | Apparatus for and method of terminal setting of integrated circuit |
5894565, | May 20 1996 | Atmel Corporation | Field programmable gate array with distributed RAM and increased cell utilization |
5926036, | Sep 03 1991 | Altera Corporation | Programmable logic array circuits comprising look up table implementation of fast carry adders and counters |
5936426, | Feb 03 1997 | MICROSEMI SOC CORP | Logic function module for field programmable array |
5940603, | Jun 24 1993 | Cadence Design Systems, INC | Method and apparatus for emulating multi-ported memory circuits |
5960191, | May 30 1997 | Cadence Design Systems, INC | Emulation system with time-multiplexed interconnect |
5963735, | Dec 02 1988 | Quickturn Design Systems, Inc. | Hardware logic emulation system |
5970240, | Jun 25 1997 | Cadence Design Systems, INC | Method and apparatus for configurable memory emulation |
5977791, | Apr 15 1996 | Altera Corporation | Embedded memory block with FIFO mode for programmable logic device |
5986468, | Mar 06 1991 | QuickLogic Corporation | Programmable application specific integrated circuit and logic cell therefor |
6005410, | Dec 05 1996 | International Business Machines Corporation | Interconnect structure between heterogeneous core regions in a programmable array |
6009256, | May 02 1997 | Cadence Design Systems, INC | Simulation/emulation system and method |
6014509, | May 20 1996 | Atmel Corporation | Field programmable gate array having access to orthogonal and diagonal adjacent neighboring cells |
6018490, | Sep 03 1991 | Altera Corporation | Programmable logic array integrated circuits |
6023439, | Sep 03 1991 | Altera Corporation | Programmable logic array integrated circuits |
6026227, | May 20 1996 | Atmel Corporation | FPGA logic cell internal structure including pair of look-up tables |
6026230, | May 02 1997 | Cadence Design Systems, INC | Memory simulation system and method |
6026481, | Apr 28 1995 | XILINX, Inc. | Microprocessor with distributed registers accessible by programmable logic device |
6028808, | Sep 03 1991 | Altera Corporation | Programmable logic array integrated circuits |
6029236, | Jan 27 1997 | Altera Corporation | Field programmable gate array with high speed SRAM based configurable function block configurable as high performance logic or block of SRAM |
6034548, | Jan 21 1997 | XILINX, Inc. | Programmable delay element |
6054873, | Dec 05 1996 | International Business Machines Corporation | Interconnect structure between heterogeneous core regions in a programmable array |
6058492, | Oct 17 1996 | Cadence Design Systems, INC | Method and apparatus for design verification using emulation and simulation |
6064599, | Sep 03 1991 | Altera Corporation | Programmable logic array integrated circuits |
6072332, | Oct 14 1997 | Altera Corporation | Variable depth memories for programmable logic devices |
6078191, | Mar 06 1991 | QuickLogic Corporation | Programmable application specific integrated circuit and logic cell |
6121791, | Jun 13 1997 | PMC-SIERRA, INC , A CORPORATION OF DELAWARE | Programmable logic datapath that may be used in a field programmable device |
6128215, | Aug 19 1997 | Altera Corporation | Static random access memory circuits |
6128692, | May 18 1994 | Altera Corporation | Programming and verification address generation for random access memory blocks in programmable logic array integrated circuit devices |
6128770, | Aug 15 1989 | Lattice Semiconductor Corporation | Configurable logic array including IOB to longlines interconnect means for providing selectable access to plural longlines from each IOB (input/output block) |
6133751, | Aug 05 1998 | XILINX, Inc. | Programmable delay element |
6134173, | Sep 03 1991 | Altera Corporation | Programmable logic array integrated circuits |
6134516, | May 02 1997 | Cadence Design Systems, INC | Simulation server system and method |
6160420, | Sep 19 1986 | Actel Corporation | Programmable interconnect architecture |
6167559, | May 20 1996 | Atmel Corporation | FPGA structure having main, column and sector clock lines |
6172519, | Dec 18 1997 | XILINX, Inc.; Xilinx, Inc | Bus-hold circuit having a defined state during set-up of an in-system programmable device |
6177808, | Apr 30 1998 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | Integration of bidirectional switches with programmable logic |
6181158, | Jan 20 1995 | XILINX, Inc.; Xilinx, Inc | Configuration logic to eliminate signal contention during reconfiguration |
6239616, | Jan 21 1997 | XILINX, Inc. | Programmable delay element |
6242946, | Apr 15 1996 | Altera Corporation | Embedded memory block with FIFO mode for programmable logic device |
6292018, | Nov 05 1992 | XILINX, Inc. | Configurable cellular array |
6292021, | May 13 1998 | Atmel Corporation | FPGA structure having main, column and sector reset lines |
6339343, | Nov 24 1998 | HYUNDAI ELECTRONICS INDUSTRIES CO , LTD | Data I/O buffer control circuit |
6351142, | Jun 13 1997 | PMC-SIERRA, INC , A CORPORATION OF DELAWARE | Programmable logic datapath that may be used in a field programmable device |
6353551, | Aug 19 1997 | Altera Corporation | Static random access memory circuits |
6377911, | Dec 02 1988 | Quickturn Design Systems, Inc. | Apparatus for emulation of electronic hardware system |
6377912, | May 30 1997 | Cadence Design Systems, INC | Emulation system with time-multiplexed interconnect |
6389379, | May 02 1997 | Cadence Design Systems, INC | Converification system and method |
6421251, | May 02 1997 | Cadence Design Systems, INC | Array board interconnect system and method |
6467017, | Jun 23 1998 | Altera Corporation | Programmable logic device having embedded dual-port random access memory configurable as single-port memory |
6531888, | Jun 13 1997 | PMC-Sierra, Inc. | Programmable logic datapath that may be used in a field programmable device |
6717433, | Oct 13 1995 | Mentor Graphics Corporation; MENTOR GRAPHICS HOLDING LTD | Reconfigurable integrated circuit with integrated debugging facilities and scalable programmable interconnect |
6720796, | May 06 2001 | Altera Corporation | Multiple size memories in a programmable logic device |
6754882, | Feb 22 2002 | XILINX, Inc. | Method and system for creating a customized support package for an FPGA-based system-on-chip (SoC) |
6759870, | Sep 03 1991 | Altera Corporation | Programmable logic array integrated circuits |
6772405, | Jun 13 2002 | XILINX, Inc. | Insertable block tile for interconnecting to a device embedded in an integrated circuit |
6781407, | Jan 09 2002 | XILINX, Inc. | FPGA and embedded circuitry initialization and processing |
6798239, | Sep 28 2001 | Xilinx, Inc | Programmable gate array having interconnecting logic to support embedded fixed logic circuitry |
6803787, | Sep 25 2002 | Lattice Semiconductor Corp. | State machine in a programmable logic device |
6809551, | Jun 28 2002 | Lattice Semiconductor Corporation | Method of optimizing routing in a programmable logic device |
6812738, | Jun 28 2002 | Lattice Semiconductor Corp. | Vector routing in a programmable logic device |
6820248, | Feb 14 2002 | XILINX, Inc. | Method and apparatus for routing interconnects to devices with dissimilar pitches |
6839874, | Feb 28 2002 | XILINX, Inc. | Method and apparatus for testing an embedded device |
6842729, | Dec 02 1988 | Cadence Design Systems, INC | Apparatus for emulation of electronic systems |
6844757, | Jun 28 2002 | Lattice Semiconductor Corp. | Converting bits to vectors in a programmable logic device |
6886092, | Nov 19 2001 | XILINX, Inc. | Custom code processing in PGA by providing instructions from fixed logic processor portion to programmable dedicated processor portion |
6897679, | Sep 03 1991 | Altera Corporation | Programmable logic array integrated circuits |
6907592, | Jun 28 2002 | Lattice Semiconductor Corporation | Method of routing in a programmable logic device |
6934922, | Feb 27 2002 | XILINX, Inc. | Timing performance analysis |
6937064, | Oct 24 2002 | Altera Corporation | Versatile logic element and logic array block |
6947882, | Sep 24 1999 | Mentor Graphics Corporation; MENTOR GRAPHICS HOLDING LTD | Regionally time multiplexed emulation system |
6961919, | Mar 04 2002 | XILINX, Inc.; Xilinx, Inc | Method of designing integrated circuit having both configurable and fixed logic circuitry |
6970012, | Jun 10 2002 | XILINX, Inc. | Programmable logic device having heterogeneous programmable logic blocks |
6973405, | May 22 2002 | XILINX, Inc. | Programmable interactive verification agent |
6976160, | Feb 22 2002 | XILINX, Inc.; Xilinx, Inc | Method and system for controlling default values of flip-flops in PGA/ASIC-based designs |
6983405, | Nov 16 2001 | Xilinx, Inc.,; Xilinx, Inc | Method and apparatus for testing circuitry embedded within a field programmable gate array |
6996758, | Nov 16 2001 | XILINX, Inc.; Xilinx, Inc | Apparatus for testing an interconnecting logic fabric |
6996796, | Feb 22 2002 | XILINX, Inc. | Method and system for creating a customized support package for an FPGA-based system-on-chip (SoC) |
7007121, | Feb 27 2002 | XILINX, Inc. | Method and apparatus for synchronized buses |
7030652, | Apr 23 2004 | Altera Corporation | LUT-based logic element with support for Shannon decomposition and associated method |
7043511, | Aug 30 2002 | Lattice Semiconductor Corporation | Performing conditional operations in a programmable logic device |
7046034, | Jun 10 2002 | XILINX, Inc. | Programmable logic device having heterogeneous programmable logic blocks |
7058920, | May 06 2001 | Altera Corporation | Methods for designing PLD architectures for flexible placement of IP function blocks |
7076595, | May 18 2001 | XILINX, Inc. | Programmable logic device including programmable interface core and central processing unit |
7080300, | Nov 16 2001 | XILINX, Inc. | Testing a programmable logic device with embedded fixed logic using a scan chain |
7085973, | Jul 09 2002 | XILINX, Inc. | Testing address lines of a memory controller |
7088767, | Mar 01 2002 | XILINX, Inc. | Method and apparatus for operating a transceiver in different data rates |
7092865, | Sep 10 2002 | XILINX, Inc. | Method and apparatus for timing modeling |
7098688, | Sep 24 1999 | Siemens Industry Software Inc | Regionally time multiplexed emulation system |
7099426, | Sep 03 2002 | XILINX, Inc. | Flexible channel bonding and clock correction operations on a multi-block data path |
7111110, | Dec 10 2002 | Altera Corporation | Versatile RAM for programmable logic device |
7111217, | Feb 28 2002 | XILINX, Inc.; Xilinx, Inc | Method and system for flexibly nesting JTAG TAP controllers for FPGA-based system-on-chip (SoC) |
7111220, | Mar 01 2002 | Xilinx, Inc | Network physical layer with embedded multi-standard CRC generator |
7187709, | Mar 01 2002 | Xilinx, Inc | High speed configurable transceiver architecture |
7194600, | Nov 19 2001 | XILINX, Inc. | Method and apparatus for processing data with a programmable gate array using fixed and programmable processors |
7218133, | Oct 24 2002 | Altera Corporation | Versatile logic element and logic array block |
7254794, | Feb 27 2002 | XILINX, Inc. | Timing performance analysis |
7266632, | May 18 2001 | XILINX, Inc. | Programmable logic device including programmable interface core and central processing unit |
7379855, | Sep 10 2002 | XILINX, Inc. | Method and apparatus for timing modeling |
7382156, | Sep 04 1996 | MICROSEMI SOC CORP | Method and apparatus for universal program controlled bus architecture |
7406557, | May 18 2001 | XILINX, Inc. | Programmable logic device including programmable interface core and central processing unit |
7409664, | Aug 03 1993 | Actel Corporation | Architecture and interconnect scheme for programmable logic circuits |
7420392, | Sep 28 2001 | Xilinx, Inc | Programmable gate array and embedded circuitry initialization and processing |
7421014, | Sep 11 2003 | XILINX, Inc. | Channel bonding of a plurality of multi-gigabit transceivers |
7432734, | Oct 24 2002 | Altera Corporation | Versatile logic element and logic array block |
7433909, | Jun 25 2002 | Nvidia Corporation | Processing architecture for a reconfigurable arithmetic node |
7456653, | Mar 09 2007 | TAHOE RESEARCH, LTD | Programmable logic device having logic array block interconnect lines that can interconnect logic elements in different logic blocks |
7480763, | Dec 10 2002 | Altera Corporation | Versatile RAM for a programmable logic device |
7493375, | Apr 29 2002 | CORNAMI, INC | Storage and delivery of device features |
7508231, | Mar 09 2007 | TAHOE RESEARCH, LTD | Programmable logic device having redundancy with logic element granularity |
7526689, | Jul 09 2002 | XILINX, Inc. | Testing address lines of a memory controller |
7536615, | Mar 26 2007 | Lattice Semiconductor Corporation | Logic analyzer systems and methods for programmable logic devices |
7539848, | Nov 19 2001 | XILINX, Inc. | Configurable logic fabric including two fixed logic processors with individual interface to receive availability signal from custom operation code configured processor |
7552415, | Feb 22 2002 | XILINX, Inc. | Method and system for creating a customized support package for an FPGA-based system-on-chip (SoC) |
7555424, | Mar 16 2006 | Cadence Design Systems, INC | Method and apparatus for rewinding emulated memory circuits |
7584447, | May 06 2001 | Altera Corporation | PLD architecture for flexible placement of IP function blocks |
7602740, | Dec 10 2001 | Altera Corporation | System for adapting device standards after manufacture |
7609297, | Jun 25 2003 | Altera Corporation | Configurable hardware based digital imaging apparatus |
7620097, | Mar 22 2001 | QST Holdings, LLC | Communications module, device, and method for implementing a system acquisition function |
7624204, | Mar 22 2001 | Nvidia Corporation | Input/output controller node in an adaptable computing environment |
7646218, | Aug 03 1993 | Actel Corporation | Architecture and interconnect scheme for programmable logic circuits |
7660984, | May 13 2003 | CORNAMI, INC | Method and system for achieving individualized protected space in an operating system |
7668229, | Dec 12 2001 | CORNAMI, INC | Low I/O bandwidth method and system for implementing detection and identification of scrambling codes |
7671626, | Oct 24 2002 | Altera Corporation | Versatile logic element and logic array block |
7728624, | Oct 07 2005 | TDK-Micronas GmbH | Circuit architecture for an integrated circuit |
7743220, | Nov 22 2002 | CORNAMI, INC | External memory controller node |
7743296, | Mar 26 2007 | Lattice Semiconductor Corporation | Logic analyzer systems and methods for programmable logic devices |
7752419, | Mar 22 2001 | Altera Corporation | Method and system for managing hardware resources to implement system functions using an adaptive computing architecture |
7809050, | May 08 2001 | CORNAMI, INC | Method and system for reconfigurable channel coding |
7822109, | May 08 2001 | CORNAMI, INC | Method and system for reconfigurable channel coding |
7830173, | Sep 04 1996 | Actel Corporation | Method and apparatus for universal program controlled bus architecture |
7865847, | May 13 2002 | Altera Corporation | Method and system for creating and programming an adaptive computing engine |
7915918, | Sep 04 1996 | Actel Corporation | Method and apparatus for universal program controlled bus architecture |
7937538, | Nov 22 2002 | CORNAMI, INC | External memory controller node |
7937539, | Nov 22 2002 | CORNAMI, INC | External memory controller node |
7937591, | Oct 25 2002 | CORNAMI, INC | Method and system for providing a device which can be adapted on an ongoing basis |
7941614, | Nov 22 2002 | CORNAMI, INC | External memory controller node |
7962716, | Mar 22 2001 | Altera Corporation | Adaptive integrated circuitry with heterogeneous and reconfigurable matrices of diverse and adaptive computational units having fixed, application specific computational elements |
7979646, | Nov 22 2002 | CORNAMI, INC | External memory controller node |
7984247, | Nov 22 2002 | CORNAMI, INC | External memory controller node |
8067970, | Mar 31 2006 | Intellectual Ventures Holding 81 LLC | Multi-write memory circuit with a data input and a clock input |
8108656, | Aug 29 2002 | CORNAMI, INC | Task definition for specifying resource requirements |
8201129, | May 06 2001 | Altera Corporation | PLD architecture for flexible placement of IP function blocks |
8225073, | Nov 30 2001 | Altera Corporation | Apparatus, system and method for configuration of adaptive integrated circuitry having heterogeneous computational elements |
8249135, | May 08 2001 | CORNAMI, INC | Method and system for reconfigurable channel coding |
8250339, | Nov 30 2001 | Altera Corporation | Apparatus, method, system and executable module for configuration and operation of adaptive integrated circuitry having fixed, application specific computational elements |
8266388, | Nov 22 2002 | CORNAMI, INC | External memory controller |
8276135, | Nov 07 2002 | CORNAMI, INC | Profiling of software and circuit designs utilizing data operation analyses |
8289047, | Aug 03 1993 | Actel Corporation | Architecture and interconnect scheme for programmable logic circuits |
8356161, | Mar 22 2001 | Altera Corporation | Adaptive processor for performing an operation with simple and complex units each comprising configurably interconnected heterogeneous elements |
8407649, | May 06 2001 | Altera Corporation | PLD architecture for flexible placement of IP function blocks |
8412915, | Nov 30 2001 | Altera Corporation | Apparatus, system and method for configuration of adaptive integrated circuitry having heterogeneous computational elements |
8438522, | Sep 24 2008 | IOWA STATE UNIVERSITY RESEARCH FOUNDATION, INC | Logic element architecture for generic logic chains in programmable devices |
8442096, | Dec 12 2001 | CORNAMI, INC | Low I/O bandwidth method and system for implementing detection and identification of scrambling codes |
8504659, | Jan 04 2002 | Altera Corporation | Apparatus and method for adaptive multimedia reception and transmission in communication environments |
8533431, | Mar 22 2001 | Altera Corporation | Adaptive integrated circuitry with heterogeneous and reconfigurable matrices of diverse and adaptive computational units having fixed, application specific computational elements |
8543794, | Mar 22 2001 | Altera Corporation | Adaptive integrated circuitry with heterogenous and reconfigurable matrices of diverse and adaptive computational units having fixed, application specific computational elements |
8543795, | Mar 22 2001 | Altera Corporation | Adaptive integrated circuitry with heterogeneous and reconfigurable matrices of diverse and adaptive computational units having fixed, application specific computational elements |
8589660, | Mar 22 2001 | Altera Corporation | Method and system for managing hardware resources to implement system functions using an adaptive computing architecture |
8595683, | Apr 12 2012 | Cadence Design Systems, INC | Generating user clocks for a prototyping environment |
8661394, | Sep 24 2008 | IOWA STATE UNIVERSITY RESEARCH FOUNDATION, INC | Depth-optimal mapping of logic chains in reconfigurable fabrics |
8732646, | Jan 25 2002 | Altera Corporation | PLD architecture for flexible placement of IP function blocks |
8767804, | May 08 2001 | CORNAMI, INC | Method and system for reconfigurable channel coding |
8769214, | Nov 22 2002 | CORNAMI, INC | External memory controller node |
8880849, | Nov 30 2001 | Altera Corporation | Apparatus, method, system and executable module for configuration and operation of adaptive integrated circuitry having fixed, application specific computational elements |
9037807, | Mar 05 2001 | Scientia Sol Mentis AG | Processor arrangement on a chip including data processing, memory, and interface elements |
9037834, | Mar 22 2001 | Altera Corporation | Method and system for managing hardware resources to implement system functions using an adaptive computing architecture |
9075605, | Mar 05 2001 | Scientia Sol Mentis AG | Methods and devices for treating and processing data |
9092595, | Oct 08 1997 | Scientia Sol Mentis AG | Multiprocessor having associated RAM units |
9094014, | May 06 2001 | Altera Corporation | PLD architecture for flexible placement of IP function blocks |
9141390, | Sep 07 2001 | Scientia Sol Mentis AG | Method of processing data with an array of data processors according to application ID |
9164952, | Mar 22 2001 | Altera Corporation | Adaptive integrated circuitry with heterogeneous and reconfigurable matrices of diverse and adaptive computational units having fixed, application specific computational elements |
9170812, | Mar 21 2002 | Scientia Sol Mentis AG | Data processing system having integrated pipelined array data processor |
9250908, | Mar 05 2001 | PACT XPP SCHWEIZ AG | Multi-processor bus and cache interconnection system |
9274984, | Sep 06 2002 | PACT XPP SCHWEIZ AG | Multi-processor with selectively interconnected memory units |
9330058, | Nov 30 2001 | Altera Corporation | Apparatus, method, system and executable module for configuration and operation of adaptive integrated circuitry having fixed, application specific computational elements |
9396161, | Mar 22 2001 | Altera Corporation | Method and system for managing hardware resources to implement system functions using an adaptive computing architecture |
9436631, | Mar 05 2001 | PACT XPP SCHWEIZ AG | Chip including memory element storing higher level memory data on a page by page basis |
9552047, | Mar 05 2001 | PACT XPP SCHWEIZ AG | Multiprocessor having runtime adjustable clock and clock dependent power supply |
9594723, | Nov 30 2001 | Altera Corporation | Apparatus, system and method for configuration of adaptive integrated circuitry having fixed, application specific computational elements |
9690747, | Jun 10 1999 | Scientia Sol Mentis AG | Configurable logic integrated circuit having a multidimensional structure of configurable elements |
RE35977, | May 08 1992 | Altera Corporation | Look up table implementation of fast carry arithmetic and exclusive-or operations |
Patent | Priority | Assignee | Title |
3967251, | Apr 17 1975 | Xerox Corporation | User variable computer memory module |
Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Mar 28 1986 | XILINX, Inc. | (assignment on the face of the patent) | / | |||
Mar 28 1986 | CARTER, WILLIAM S | XILINX, INC , A CORP OF CA | ASSIGNMENT OF ASSIGNORS INTEREST | 004534 | /0089 |
Date | Maintenance Fee Events |
Feb 03 1989 | ASPN: Payor Number Assigned. |
Jan 13 1992 | M183: Payment of Maintenance Fee, 4th Year, Large Entity. |
Nov 13 1995 | M184: Payment of Maintenance Fee, 8th Year, Large Entity. |
Jan 03 1996 | RMPN: Payer Number De-assigned. |
Jan 04 2000 | M185: Payment of Maintenance Fee, 12th Year, Large Entity. |
Date | Maintenance Schedule |
Jul 19 1991 | 4 years fee payment window open |
Jan 19 1992 | 6 months grace period start (w surcharge) |
Jul 19 1992 | patent expiry (for year 4) |
Jul 19 1994 | 2 years to revive unintentionally abandoned end. (for year 4) |
Jul 19 1995 | 8 years fee payment window open |
Jan 19 1996 | 6 months grace period start (w surcharge) |
Jul 19 1996 | patent expiry (for year 8) |
Jul 19 1998 | 2 years to revive unintentionally abandoned end. (for year 8) |
Jul 19 1999 | 12 years fee payment window open |
Jan 19 2000 | 6 months grace period start (w surcharge) |
Jul 19 2000 | patent expiry (for year 12) |
Jul 19 2002 | 2 years to revive unintentionally abandoned end. (for year 12) |